Gisser and Sánchez (1980a) state the conditions under which welfare gains from policy intervention are negligible in aquifer management, when compared with non-regulation or “free market” outcomes. This is the so-called Gisser-Sánchez effect (GSE), which has been supported by the ensuing literature during recent decades. The GSE requires a number of assumptions, among which is the disregard for...

Head measurements at a single observation well during a cross-hole pumping test carry a great amount of information about aquifer heterogeneity other than the average property of the aquifer as implied in Theis analysis of aquifer test. In this commentary, we use simple examples and a probabilistic reasoning approach based on Darcy’s law to unravel this information, buried in the results of qua...

Introduction Guarani Aquifer System (SAG) is the formal denomination for a transboundary aquifer underlying four countries (Argentina, Brazil, Paraguay and Uruguay) in South America. Due to its strategic importance, a joint research project aiming for sustainable management and preservation of the aquifer was initiated by the four neighbour countries together. In this work, an overview of hydro...

Please cite this article in press as: Ayotte, J.D., trace elements at water-supply wells. Appl. Geo The effects of human-induced alteration of groundwater flow patterns on concentrations of naturallyoccurring trace elements were examined in five hydrologically distinct aquifer systems in the USA. Although naturally occurring, these trace elements can exceed concentrations that are considered ha...

The recession flow analysis of Brutsaert and Nieber [1977] extended by Troch et al. [1993] to estimate aquifer parameters (saturated hydraulic conductivity and mean aquifer depth) is examined by means of a numerical model. It is found to be reliable for the estimation of the catchment-scale saturated hydraulic conductivity and mean aquifer depth. Increasing the complexity of the synthetic water...

In this paper, a saltwater intrusion model, in view to study the dynamics of interface between and freshwater coastal aquifer, is established. This dynamic caused by an injection pumping through well located given position. From flow model each phase, we defined appropriate hypothesis obtain our global based only on height interface. The numerical simulation led us effect parameters some empiri...

Saltwater intrusion (SWI) is a type of pollution that adversely affects the quality groundwater in coastal aquifers. The Nile Delta aquifer (NDA) Egypt contains large amount freshwater. Increasing abstraction from and sea level rise have led to an increase SWI, which has reached up 100 km inland. Therefore, practical measures are required prevent further SWI. This study aims identify optimal we...

The groundwater of the Ghis-Nekor aquifer (Central Rif Morocco) is main water resource used by inhabitants for agricultural and domestic purposes. However, its low quality may affect health consumer weaken production. existence WWTP at level this plain, makes it a probable source pollution these requires urgent managers’ intervention. Groundwater in area be related to natural, anthropogenic und...

Water quality conditions have been assessed in the Río Vélez coastal aquifer (Andalusia, South Spain: an area of important agricultural and touristic development). This shallow fluvio-deltaic aquifer consists of coarse detrital deposits, of Quaternary age, that extend over about 20 km, being subdivided in two sectors –fluvial and deltaicby a substratum elevation. The deltaic sector is highly vu...